1 /* 2 * acpi_osl.c - OS-dependent functions ($Revision: 83 $) 3 * 4 * Copyright (C) 2000 Andrew Henroid 5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 7 * Copyright (c) 2008 Intel Corporation 8 * Author: Matthew Wilcox <willy@linux.intel.com> 9 * 10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 23 * 24 */ 25 26 #include <linux/module.h> 27 #include <linux/kernel.h> 28 #include <linux/slab.h> 29 #include <linux/mm.h> 30 #include <linux/highmem.h> 31 #include <linux/pci.h> 32 #include <linux/interrupt.h> 33 #include <linux/kmod.h> 34 #include <linux/delay.h> 35 #include <linux/workqueue.h> 36 #include <linux/nmi.h> 37 #include <linux/acpi.h> 38 #include <linux/efi.h> 39 #include <linux/ioport.h> 40 #include <linux/list.h> 41 #include <linux/jiffies.h> 42 #include <linux/semaphore.h> 43 44 #include <asm/io.h> 45 #include <asm/uaccess.h> 46 #include <linux/io-64-nonatomic-lo-hi.h> 47 48 #include "internal.h" 49 50 #define _COMPONENT ACPI_OS_SERVICES 51 ACPI_MODULE_NAME("osl"); 52 53 struct acpi_os_dpc { 54 acpi_osd_exec_callback function; 55 void *context; 56 struct work_struct work; 57 }; 58 59 #ifdef CONFIG_ACPI_CUSTOM_DSDT 60 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 61 #endif 62 63 #ifdef ENABLE_DEBUGGER 64 #include <linux/kdb.h> 65 66 /* stuff for debugger support */ 67 int acpi_in_debugger; 68 EXPORT_SYMBOL(acpi_in_debugger); 69 #endif /*ENABLE_DEBUGGER */ 70 71 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl, 72 u32 pm1b_ctrl); 73 static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a, 74 u32 val_b); 75 76 static acpi_osd_handler acpi_irq_handler; 77 static void *acpi_irq_context; 78 static struct workqueue_struct *kacpid_wq; 79 static struct workqueue_struct *kacpi_notify_wq; 80 static struct workqueue_struct *kacpi_hotplug_wq; 81 static bool acpi_os_initialized; 82 unsigned int acpi_sci_irq = INVALID_ACPI_IRQ; 83 84 /* 85 * This list of permanent mappings is for memory that may be accessed from 86 * interrupt context, where we can't do the ioremap(). 87 */ 88 struct acpi_ioremap { 89 struct list_head list; 90 void __iomem *virt; 91 acpi_physical_address phys; 92 acpi_size size; 93 unsigned long refcount; 94 }; 95 96 static LIST_HEAD(acpi_ioremaps); 97 static DEFINE_MUTEX(acpi_ioremap_lock); 98 99 static void __init acpi_osi_setup_late(void); 100 101 /* 102 * The story of _OSI(Linux) 103 * 104 * From pre-history through Linux-2.6.22, 105 * Linux responded TRUE upon a BIOS OSI(Linux) query. 106 * 107 * Unfortunately, reference BIOS writers got wind of this 108 * and put OSI(Linux) in their example code, quickly exposing 109 * this string as ill-conceived and opening the door to 110 * an un-bounded number of BIOS incompatibilities. 111 * 112 * For example, OSI(Linux) was used on resume to re-POST a 113 * video card on one system, because Linux at that time 114 * could not do a speedy restore in its native driver. 115 * But then upon gaining quick native restore capability, 116 * Linux has no way to tell the BIOS to skip the time-consuming 117 * POST -- putting Linux at a permanent performance disadvantage. 118 * On another system, the BIOS writer used OSI(Linux) 119 * to infer native OS support for IPMI! On other systems, 120 * OSI(Linux) simply got in the way of Linux claiming to 121 * be compatible with other operating systems, exposing 122 * BIOS issues such as skipped device initialization. 123 * 124 * So "Linux" turned out to be a really poor chose of 125 * OSI string, and from Linux-2.6.23 onward we respond FALSE. 126 * 127 * BIOS writers should NOT query _OSI(Linux) on future systems. 128 * Linux will complain on the console when it sees it, and return FALSE. 129 * To get Linux to return TRUE for your system will require 130 * a kernel source update to add a DMI entry, 131 * or boot with "acpi_osi=Linux" 132 */ 133 134 static struct osi_linux { 135 unsigned int enable:1; 136 unsigned int dmi:1; 137 unsigned int cmdline:1; 138 unsigned int default_disabling:1; 139 } osi_linux = {0, 0, 0, 0}; 140 141 static u32 acpi_osi_handler(acpi_string interface, u32 supported) 142 { 143 if (!strcmp("Linux", interface)) { 144 145 printk_once(KERN_NOTICE FW_BUG PREFIX 146 "BIOS _OSI(Linux) query %s%s\n", 147 osi_linux.enable ? "honored" : "ignored", 148 osi_linux.cmdline ? " via cmdline" : 149 osi_linux.dmi ? " via DMI" : ""); 150 } 151 152 if (!strcmp("Darwin", interface)) { 153 /* 154 * Apple firmware will behave poorly if it receives positive 155 * answers to "Darwin" and any other OS. Respond positively 156 * to Darwin and then disable all other vendor strings. 157 */ 158 acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS); 159 supported = ACPI_UINT32_MAX; 160 } 161 162 return supported; 163 } 164 165 static void __init acpi_request_region (struct acpi_generic_address *gas, 166 unsigned int length, char *desc) 167 { 168 u64 addr; 169 170 /* Handle possible alignment issues */ 171 memcpy(&addr, &gas->address, sizeof(addr)); 172 if (!addr || !length) 173 return; 174 175 /* Resources are never freed */ 176 if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) 177 request_region(addr, length, desc); 178 else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) 179 request_mem_region(addr, length, desc); 180 } 181 182 static int __init acpi_reserve_resources(void) 183 { 184 acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length, 185 "ACPI PM1a_EVT_BLK"); 186 187 acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length, 188 "ACPI PM1b_EVT_BLK"); 189 190 acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length, 191 "ACPI PM1a_CNT_BLK"); 192 193 acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length, 194 "ACPI PM1b_CNT_BLK"); 195 196 if (acpi_gbl_FADT.pm_timer_length == 4) 197 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR"); 198 199 acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length, 200 "ACPI PM2_CNT_BLK"); 201 202 /* Length of GPE blocks must be a non-negative multiple of 2 */ 203 204 if (!(acpi_gbl_FADT.gpe0_block_length & 0x1)) 205 acpi_request_region(&acpi_gbl_FADT.xgpe0_block, 206 acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK"); 207 208 if (!(acpi_gbl_FADT.gpe1_block_length & 0x1)) 209 acpi_request_region(&acpi_gbl_FADT.xgpe1_block, 210 acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK"); 211 212 return 0; 213 } 214 fs_initcall_sync(acpi_reserve_resources); 215 216 void acpi_os_printf(const char *fmt, ...) 217 { 218 va_list args; 219 va_start(args, fmt); 220 acpi_os_vprintf(fmt, args); 221 va_end(args); 222 } 223 224 void acpi_os_vprintf(const char *fmt, va_list args) 225 { 226 static char buffer[512]; 227 228 vsprintf(buffer, fmt, args); 229 230 #ifdef ENABLE_DEBUGGER 231 if (acpi_in_debugger) { 232 kdb_printf("%s", buffer); 233 } else { 234 printk(KERN_CONT "%s", buffer); 235 } 236 #else 237 printk(KERN_CONT "%s", buffer); 238 #endif 239 } 240 241 #ifdef CONFIG_KEXEC 242 static unsigned long acpi_rsdp; 243 static int __init setup_acpi_rsdp(char *arg) 244 { 245 if (kstrtoul(arg, 16, &acpi_rsdp)) 246 return -EINVAL; 247 return 0; 248 } 249 early_param("acpi_rsdp", setup_acpi_rsdp); 250 #endif 251 252 acpi_physical_address __init acpi_os_get_root_pointer(void) 253 { 254 #ifdef CONFIG_KEXEC 255 if (acpi_rsdp) 256 return acpi_rsdp; 257 #endif 258 259 if (efi_enabled(EFI_CONFIG_TABLES)) { 260 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 261 return efi.acpi20; 262 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 263 return efi.acpi; 264 else { 265 printk(KERN_ERR PREFIX 266 "System description tables not found\n"); 267 return 0; 268 } 269 } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) { 270 acpi_physical_address pa = 0; 271 272 acpi_find_root_pointer(&pa); 273 return pa; 274 } 275 276 return 0; 277 } 278 279 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 280 static struct acpi_ioremap * 281 acpi_map_lookup(acpi_physical_address phys, acpi_size size) 282 { 283 struct acpi_ioremap *map; 284 285 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 286 if (map->phys <= phys && 287 phys + size <= map->phys + map->size) 288 return map; 289 290 return NULL; 291 } 292 293 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 294 static void __iomem * 295 acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) 296 { 297 struct acpi_ioremap *map; 298 299 map = acpi_map_lookup(phys, size); 300 if (map) 301 return map->virt + (phys - map->phys); 302 303 return NULL; 304 } 305 306 void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) 307 { 308 struct acpi_ioremap *map; 309 void __iomem *virt = NULL; 310 311 mutex_lock(&acpi_ioremap_lock); 312 map = acpi_map_lookup(phys, size); 313 if (map) { 314 virt = map->virt + (phys - map->phys); 315 map->refcount++; 316 } 317 mutex_unlock(&acpi_ioremap_lock); 318 return virt; 319 } 320 EXPORT_SYMBOL_GPL(acpi_os_get_iomem); 321 322 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ 323 static struct acpi_ioremap * 324 acpi_map_lookup_virt(void __iomem *virt, acpi_size size) 325 { 326 struct acpi_ioremap *map; 327 328 list_for_each_entry_rcu(map, &acpi_ioremaps, list) 329 if (map->virt <= virt && 330 virt + size <= map->virt + map->size) 331 return map; 332 333 return NULL; 334 } 335 336 #if defined(CONFIG_IA64) || defined(CONFIG_ARM64) 337 /* ioremap will take care of cache attributes */ 338 #define should_use_kmap(pfn) 0 339 #else 340 #define should_use_kmap(pfn) page_is_ram(pfn) 341 #endif 342 343 static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz) 344 { 345 unsigned long pfn; 346 347 pfn = pg_off >> PAGE_SHIFT; 348 if (should_use_kmap(pfn)) { 349 if (pg_sz > PAGE_SIZE) 350 return NULL; 351 return (void __iomem __force *)kmap(pfn_to_page(pfn)); 352 } else 353 return acpi_os_ioremap(pg_off, pg_sz); 354 } 355 356 static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr) 357 { 358 unsigned long pfn; 359 360 pfn = pg_off >> PAGE_SHIFT; 361 if (should_use_kmap(pfn)) 362 kunmap(pfn_to_page(pfn)); 363 else 364 iounmap(vaddr); 365 } 366 367 void __iomem *__init_refok 368 acpi_os_map_iomem(acpi_physical_address phys, acpi_size size) 369 { 370 struct acpi_ioremap *map; 371 void __iomem *virt; 372 acpi_physical_address pg_off; 373 acpi_size pg_sz; 374 375 if (phys > ULONG_MAX) { 376 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 377 return NULL; 378 } 379 380 if (!acpi_gbl_permanent_mmap) 381 return __acpi_map_table((unsigned long)phys, size); 382 383 mutex_lock(&acpi_ioremap_lock); 384 /* Check if there's a suitable mapping already. */ 385 map = acpi_map_lookup(phys, size); 386 if (map) { 387 map->refcount++; 388 goto out; 389 } 390 391 map = kzalloc(sizeof(*map), GFP_KERNEL); 392 if (!map) { 393 mutex_unlock(&acpi_ioremap_lock); 394 return NULL; 395 } 396 397 pg_off = round_down(phys, PAGE_SIZE); 398 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; 399 virt = acpi_map(pg_off, pg_sz); 400 if (!virt) { 401 mutex_unlock(&acpi_ioremap_lock); 402 kfree(map); 403 return NULL; 404 } 405 406 INIT_LIST_HEAD(&map->list); 407 map->virt = virt; 408 map->phys = pg_off; 409 map->size = pg_sz; 410 map->refcount = 1; 411 412 list_add_tail_rcu(&map->list, &acpi_ioremaps); 413 414 out: 415 mutex_unlock(&acpi_ioremap_lock); 416 return map->virt + (phys - map->phys); 417 } 418 EXPORT_SYMBOL_GPL(acpi_os_map_iomem); 419 420 void *__init_refok 421 acpi_os_map_memory(acpi_physical_address phys, acpi_size size) 422 { 423 return (void *)acpi_os_map_iomem(phys, size); 424 } 425 EXPORT_SYMBOL_GPL(acpi_os_map_memory); 426 427 static void acpi_os_drop_map_ref(struct acpi_ioremap *map) 428 { 429 if (!--map->refcount) 430 list_del_rcu(&map->list); 431 } 432 433 static void acpi_os_map_cleanup(struct acpi_ioremap *map) 434 { 435 if (!map->refcount) { 436 synchronize_rcu_expedited(); 437 acpi_unmap(map->phys, map->virt); 438 kfree(map); 439 } 440 } 441 442 void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size) 443 { 444 struct acpi_ioremap *map; 445 446 if (!acpi_gbl_permanent_mmap) { 447 __acpi_unmap_table(virt, size); 448 return; 449 } 450 451 mutex_lock(&acpi_ioremap_lock); 452 map = acpi_map_lookup_virt(virt, size); 453 if (!map) { 454 mutex_unlock(&acpi_ioremap_lock); 455 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); 456 return; 457 } 458 acpi_os_drop_map_ref(map); 459 mutex_unlock(&acpi_ioremap_lock); 460 461 acpi_os_map_cleanup(map); 462 } 463 EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem); 464 465 void __ref acpi_os_unmap_memory(void *virt, acpi_size size) 466 { 467 return acpi_os_unmap_iomem((void __iomem *)virt, size); 468 } 469 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); 470 471 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size) 472 { 473 if (!acpi_gbl_permanent_mmap) 474 __acpi_unmap_table(virt, size); 475 } 476 477 int acpi_os_map_generic_address(struct acpi_generic_address *gas) 478 { 479 u64 addr; 480 void __iomem *virt; 481 482 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 483 return 0; 484 485 /* Handle possible alignment issues */ 486 memcpy(&addr, &gas->address, sizeof(addr)); 487 if (!addr || !gas->bit_width) 488 return -EINVAL; 489 490 virt = acpi_os_map_iomem(addr, gas->bit_width / 8); 491 if (!virt) 492 return -EIO; 493 494 return 0; 495 } 496 EXPORT_SYMBOL(acpi_os_map_generic_address); 497 498 void acpi_os_unmap_generic_address(struct acpi_generic_address *gas) 499 { 500 u64 addr; 501 struct acpi_ioremap *map; 502 503 if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) 504 return; 505 506 /* Handle possible alignment issues */ 507 memcpy(&addr, &gas->address, sizeof(addr)); 508 if (!addr || !gas->bit_width) 509 return; 510 511 mutex_lock(&acpi_ioremap_lock); 512 map = acpi_map_lookup(addr, gas->bit_width / 8); 513 if (!map) { 514 mutex_unlock(&acpi_ioremap_lock); 515 return; 516 } 517 acpi_os_drop_map_ref(map); 518 mutex_unlock(&acpi_ioremap_lock); 519 520 acpi_os_map_cleanup(map); 521 } 522 EXPORT_SYMBOL(acpi_os_unmap_generic_address); 523 524 #ifdef ACPI_FUTURE_USAGE 525 acpi_status 526 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys) 527 { 528 if (!phys || !virt) 529 return AE_BAD_PARAMETER; 530 531 *phys = virt_to_phys(virt); 532 533 return AE_OK; 534 } 535 #endif 536 537 #ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE 538 static bool acpi_rev_override; 539 540 int __init acpi_rev_override_setup(char *str) 541 { 542 acpi_rev_override = true; 543 return 1; 544 } 545 __setup("acpi_rev_override", acpi_rev_override_setup); 546 #else 547 #define acpi_rev_override false 548 #endif 549 550 #define ACPI_MAX_OVERRIDE_LEN 100 551 552 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN]; 553 554 acpi_status 555 acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 556 char **new_val) 557 { 558 if (!init_val || !new_val) 559 return AE_BAD_PARAMETER; 560 561 *new_val = NULL; 562 if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) { 563 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n", 564 acpi_os_name); 565 *new_val = acpi_os_name; 566 } 567 568 if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) { 569 printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n"); 570 *new_val = (char *)5; 571 } 572 573 return AE_OK; 574 } 575 576 #ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 577 #include <linux/earlycpio.h> 578 #include <linux/memblock.h> 579 580 static u64 acpi_tables_addr; 581 static int all_tables_size; 582 583 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 584 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 585 { 586 u8 sum = 0; 587 u8 *end = buffer + length; 588 589 while (buffer < end) 590 sum = (u8) (sum + *(buffer++)); 591 return sum; 592 } 593 594 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 595 static const char * const table_sigs[] = { 596 ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, 597 ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, 598 ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, 599 ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, 600 ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, 601 ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, 602 ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, 603 ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, 604 ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL }; 605 606 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 607 608 #define ACPI_OVERRIDE_TABLES 64 609 static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES]; 610 611 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 612 613 void __init acpi_initrd_override(void *data, size_t size) 614 { 615 int sig, no, table_nr = 0, total_offset = 0; 616 long offset = 0; 617 struct acpi_table_header *table; 618 char cpio_path[32] = "kernel/firmware/acpi/"; 619 struct cpio_data file; 620 621 if (data == NULL || size == 0) 622 return; 623 624 for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) { 625 file = find_cpio_data(cpio_path, data, size, &offset); 626 if (!file.data) 627 break; 628 629 data += offset; 630 size -= offset; 631 632 if (file.size < sizeof(struct acpi_table_header)) { 633 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 634 cpio_path, file.name); 635 continue; 636 } 637 638 table = file.data; 639 640 for (sig = 0; table_sigs[sig]; sig++) 641 if (!memcmp(table->signature, table_sigs[sig], 4)) 642 break; 643 644 if (!table_sigs[sig]) { 645 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 646 cpio_path, file.name); 647 continue; 648 } 649 if (file.size != table->length) { 650 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 651 cpio_path, file.name); 652 continue; 653 } 654 if (acpi_table_checksum(file.data, table->length)) { 655 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 656 cpio_path, file.name); 657 continue; 658 } 659 660 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 661 table->signature, cpio_path, file.name, table->length); 662 663 all_tables_size += table->length; 664 acpi_initrd_files[table_nr].data = file.data; 665 acpi_initrd_files[table_nr].size = file.size; 666 table_nr++; 667 } 668 if (table_nr == 0) 669 return; 670 671 acpi_tables_addr = 672 memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT, 673 all_tables_size, PAGE_SIZE); 674 if (!acpi_tables_addr) { 675 WARN_ON(1); 676 return; 677 } 678 /* 679 * Only calling e820_add_reserve does not work and the 680 * tables are invalid (memory got used) later. 681 * memblock_reserve works as expected and the tables won't get modified. 682 * But it's not enough on X86 because ioremap will 683 * complain later (used by acpi_os_map_memory) that the pages 684 * that should get mapped are not marked "reserved". 685 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area) 686 * works fine. 687 */ 688 memblock_reserve(acpi_tables_addr, all_tables_size); 689 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 690 691 /* 692 * early_ioremap only can remap 256k one time. If we map all 693 * tables one time, we will hit the limit. Need to map chunks 694 * one by one during copying the same as that in relocate_initrd(). 695 */ 696 for (no = 0; no < table_nr; no++) { 697 unsigned char *src_p = acpi_initrd_files[no].data; 698 phys_addr_t size = acpi_initrd_files[no].size; 699 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 700 phys_addr_t slop, clen; 701 char *dest_p; 702 703 total_offset += size; 704 705 while (size) { 706 slop = dest_addr & ~PAGE_MASK; 707 clen = size; 708 if (clen > MAP_CHUNK_SIZE - slop) 709 clen = MAP_CHUNK_SIZE - slop; 710 dest_p = early_ioremap(dest_addr & PAGE_MASK, 711 clen + slop); 712 memcpy(dest_p + slop, src_p, clen); 713 early_iounmap(dest_p, clen + slop); 714 src_p += clen; 715 dest_addr += clen; 716 size -= clen; 717 } 718 } 719 } 720 #endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */ 721 722 static void acpi_table_taint(struct acpi_table_header *table) 723 { 724 pr_warn(PREFIX 725 "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 726 table->signature, table->oem_table_id); 727 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 728 } 729 730 731 acpi_status 732 acpi_os_table_override(struct acpi_table_header * existing_table, 733 struct acpi_table_header ** new_table) 734 { 735 if (!existing_table || !new_table) 736 return AE_BAD_PARAMETER; 737 738 *new_table = NULL; 739 740 #ifdef CONFIG_ACPI_CUSTOM_DSDT 741 if (strncmp(existing_table->signature, "DSDT", 4) == 0) 742 *new_table = (struct acpi_table_header *)AmlCode; 743 #endif 744 if (*new_table != NULL) 745 acpi_table_taint(existing_table); 746 return AE_OK; 747 } 748 749 acpi_status 750 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 751 acpi_physical_address *address, 752 u32 *table_length) 753 { 754 #ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE 755 *table_length = 0; 756 *address = 0; 757 return AE_OK; 758 #else 759 int table_offset = 0; 760 struct acpi_table_header *table; 761 762 *table_length = 0; 763 *address = 0; 764 765 if (!acpi_tables_addr) 766 return AE_OK; 767 768 do { 769 if (table_offset + ACPI_HEADER_SIZE > all_tables_size) { 770 WARN_ON(1); 771 return AE_OK; 772 } 773 774 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 775 ACPI_HEADER_SIZE); 776 777 if (table_offset + table->length > all_tables_size) { 778 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 779 WARN_ON(1); 780 return AE_OK; 781 } 782 783 table_offset += table->length; 784 785 if (memcmp(existing_table->signature, table->signature, 4)) { 786 acpi_os_unmap_memory(table, 787 ACPI_HEADER_SIZE); 788 continue; 789 } 790 791 /* Only override tables with matching oem id */ 792 if (memcmp(table->oem_table_id, existing_table->oem_table_id, 793 ACPI_OEM_TABLE_ID_SIZE)) { 794 acpi_os_unmap_memory(table, 795 ACPI_HEADER_SIZE); 796 continue; 797 } 798 799 table_offset -= table->length; 800 *table_length = table->length; 801 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 802 *address = acpi_tables_addr + table_offset; 803 break; 804 } while (table_offset + ACPI_HEADER_SIZE < all_tables_size); 805 806 if (*address != 0) 807 acpi_table_taint(existing_table); 808 return AE_OK; 809 #endif 810 } 811 812 static irqreturn_t acpi_irq(int irq, void *dev_id) 813 { 814 u32 handled; 815 816 handled = (*acpi_irq_handler) (acpi_irq_context); 817 818 if (handled) { 819 acpi_irq_handled++; 820 return IRQ_HANDLED; 821 } else { 822 acpi_irq_not_handled++; 823 return IRQ_NONE; 824 } 825 } 826 827 acpi_status 828 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, 829 void *context) 830 { 831 unsigned int irq; 832 833 acpi_irq_stats_init(); 834 835 /* 836 * ACPI interrupts different from the SCI in our copy of the FADT are 837 * not supported. 838 */ 839 if (gsi != acpi_gbl_FADT.sci_interrupt) 840 return AE_BAD_PARAMETER; 841 842 if (acpi_irq_handler) 843 return AE_ALREADY_ACQUIRED; 844 845 if (acpi_gsi_to_irq(gsi, &irq) < 0) { 846 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n", 847 gsi); 848 return AE_OK; 849 } 850 851 acpi_irq_handler = handler; 852 acpi_irq_context = context; 853 if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) { 854 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq); 855 acpi_irq_handler = NULL; 856 return AE_NOT_ACQUIRED; 857 } 858 acpi_sci_irq = irq; 859 860 return AE_OK; 861 } 862 863 acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler) 864 { 865 if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid()) 866 return AE_BAD_PARAMETER; 867 868 free_irq(acpi_sci_irq, acpi_irq); 869 acpi_irq_handler = NULL; 870 acpi_sci_irq = INVALID_ACPI_IRQ; 871 872 return AE_OK; 873 } 874 875 /* 876 * Running in interpreter thread context, safe to sleep 877 */ 878 879 void acpi_os_sleep(u64 ms) 880 { 881 msleep(ms); 882 } 883 884 void acpi_os_stall(u32 us) 885 { 886 while (us) { 887 u32 delay = 1000; 888 889 if (delay > us) 890 delay = us; 891 udelay(delay); 892 touch_nmi_watchdog(); 893 us -= delay; 894 } 895 } 896 897 /* 898 * Support ACPI 3.0 AML Timer operand 899 * Returns 64-bit free-running, monotonically increasing timer 900 * with 100ns granularity 901 */ 902 u64 acpi_os_get_timer(void) 903 { 904 u64 time_ns = ktime_to_ns(ktime_get()); 905 do_div(time_ns, 100); 906 return time_ns; 907 } 908 909 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 910 { 911 u32 dummy; 912 913 if (!value) 914 value = &dummy; 915 916 *value = 0; 917 if (width <= 8) { 918 *(u8 *) value = inb(port); 919 } else if (width <= 16) { 920 *(u16 *) value = inw(port); 921 } else if (width <= 32) { 922 *(u32 *) value = inl(port); 923 } else { 924 BUG(); 925 } 926 927 return AE_OK; 928 } 929 930 EXPORT_SYMBOL(acpi_os_read_port); 931 932 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) 933 { 934 if (width <= 8) { 935 outb(value, port); 936 } else if (width <= 16) { 937 outw(value, port); 938 } else if (width <= 32) { 939 outl(value, port); 940 } else { 941 BUG(); 942 } 943 944 return AE_OK; 945 } 946 947 EXPORT_SYMBOL(acpi_os_write_port); 948 949 acpi_status 950 acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width) 951 { 952 void __iomem *virt_addr; 953 unsigned int size = width / 8; 954 bool unmap = false; 955 u64 dummy; 956 957 rcu_read_lock(); 958 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 959 if (!virt_addr) { 960 rcu_read_unlock(); 961 virt_addr = acpi_os_ioremap(phys_addr, size); 962 if (!virt_addr) 963 return AE_BAD_ADDRESS; 964 unmap = true; 965 } 966 967 if (!value) 968 value = &dummy; 969 970 switch (width) { 971 case 8: 972 *(u8 *) value = readb(virt_addr); 973 break; 974 case 16: 975 *(u16 *) value = readw(virt_addr); 976 break; 977 case 32: 978 *(u32 *) value = readl(virt_addr); 979 break; 980 case 64: 981 *(u64 *) value = readq(virt_addr); 982 break; 983 default: 984 BUG(); 985 } 986 987 if (unmap) 988 iounmap(virt_addr); 989 else 990 rcu_read_unlock(); 991 992 return AE_OK; 993 } 994 995 acpi_status 996 acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width) 997 { 998 void __iomem *virt_addr; 999 unsigned int size = width / 8; 1000 bool unmap = false; 1001 1002 rcu_read_lock(); 1003 virt_addr = acpi_map_vaddr_lookup(phys_addr, size); 1004 if (!virt_addr) { 1005 rcu_read_unlock(); 1006 virt_addr = acpi_os_ioremap(phys_addr, size); 1007 if (!virt_addr) 1008 return AE_BAD_ADDRESS; 1009 unmap = true; 1010 } 1011 1012 switch (width) { 1013 case 8: 1014 writeb(value, virt_addr); 1015 break; 1016 case 16: 1017 writew(value, virt_addr); 1018 break; 1019 case 32: 1020 writel(value, virt_addr); 1021 break; 1022 case 64: 1023 writeq(value, virt_addr); 1024 break; 1025 default: 1026 BUG(); 1027 } 1028 1029 if (unmap) 1030 iounmap(virt_addr); 1031 else 1032 rcu_read_unlock(); 1033 1034 return AE_OK; 1035 } 1036 1037 acpi_status 1038 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1039 u64 *value, u32 width) 1040 { 1041 int result, size; 1042 u32 value32; 1043 1044 if (!value) 1045 return AE_BAD_PARAMETER; 1046 1047 switch (width) { 1048 case 8: 1049 size = 1; 1050 break; 1051 case 16: 1052 size = 2; 1053 break; 1054 case 32: 1055 size = 4; 1056 break; 1057 default: 1058 return AE_ERROR; 1059 } 1060 1061 result = raw_pci_read(pci_id->segment, pci_id->bus, 1062 PCI_DEVFN(pci_id->device, pci_id->function), 1063 reg, size, &value32); 1064 *value = value32; 1065 1066 return (result ? AE_ERROR : AE_OK); 1067 } 1068 1069 acpi_status 1070 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg, 1071 u64 value, u32 width) 1072 { 1073 int result, size; 1074 1075 switch (width) { 1076 case 8: 1077 size = 1; 1078 break; 1079 case 16: 1080 size = 2; 1081 break; 1082 case 32: 1083 size = 4; 1084 break; 1085 default: 1086 return AE_ERROR; 1087 } 1088 1089 result = raw_pci_write(pci_id->segment, pci_id->bus, 1090 PCI_DEVFN(pci_id->device, pci_id->function), 1091 reg, size, value); 1092 1093 return (result ? AE_ERROR : AE_OK); 1094 } 1095 1096 static void acpi_os_execute_deferred(struct work_struct *work) 1097 { 1098 struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); 1099 1100 dpc->function(dpc->context); 1101 kfree(dpc); 1102 } 1103 1104 /******************************************************************************* 1105 * 1106 * FUNCTION: acpi_os_execute 1107 * 1108 * PARAMETERS: Type - Type of the callback 1109 * Function - Function to be executed 1110 * Context - Function parameters 1111 * 1112 * RETURN: Status 1113 * 1114 * DESCRIPTION: Depending on type, either queues function for deferred execution or 1115 * immediately executes function on a separate thread. 1116 * 1117 ******************************************************************************/ 1118 1119 acpi_status acpi_os_execute(acpi_execute_type type, 1120 acpi_osd_exec_callback function, void *context) 1121 { 1122 acpi_status status = AE_OK; 1123 struct acpi_os_dpc *dpc; 1124 struct workqueue_struct *queue; 1125 int ret; 1126 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1127 "Scheduling function [%p(%p)] for deferred execution.\n", 1128 function, context)); 1129 1130 /* 1131 * Allocate/initialize DPC structure. Note that this memory will be 1132 * freed by the callee. The kernel handles the work_struct list in a 1133 * way that allows us to also free its memory inside the callee. 1134 * Because we may want to schedule several tasks with different 1135 * parameters we can't use the approach some kernel code uses of 1136 * having a static work_struct. 1137 */ 1138 1139 dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); 1140 if (!dpc) 1141 return AE_NO_MEMORY; 1142 1143 dpc->function = function; 1144 dpc->context = context; 1145 1146 /* 1147 * To prevent lockdep from complaining unnecessarily, make sure that 1148 * there is a different static lockdep key for each workqueue by using 1149 * INIT_WORK() for each of them separately. 1150 */ 1151 if (type == OSL_NOTIFY_HANDLER) { 1152 queue = kacpi_notify_wq; 1153 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1154 } else { 1155 queue = kacpid_wq; 1156 INIT_WORK(&dpc->work, acpi_os_execute_deferred); 1157 } 1158 1159 /* 1160 * On some machines, a software-initiated SMI causes corruption unless 1161 * the SMI runs on CPU 0. An SMI can be initiated by any AML, but 1162 * typically it's done in GPE-related methods that are run via 1163 * workqueues, so we can avoid the known corruption cases by always 1164 * queueing on CPU 0. 1165 */ 1166 ret = queue_work_on(0, queue, &dpc->work); 1167 1168 if (!ret) { 1169 printk(KERN_ERR PREFIX 1170 "Call to queue_work() failed.\n"); 1171 status = AE_ERROR; 1172 kfree(dpc); 1173 } 1174 return status; 1175 } 1176 EXPORT_SYMBOL(acpi_os_execute); 1177 1178 void acpi_os_wait_events_complete(void) 1179 { 1180 /* 1181 * Make sure the GPE handler or the fixed event handler is not used 1182 * on another CPU after removal. 1183 */ 1184 if (acpi_sci_irq_valid()) 1185 synchronize_hardirq(acpi_sci_irq); 1186 flush_workqueue(kacpid_wq); 1187 flush_workqueue(kacpi_notify_wq); 1188 } 1189 1190 struct acpi_hp_work { 1191 struct work_struct work; 1192 struct acpi_device *adev; 1193 u32 src; 1194 }; 1195 1196 static void acpi_hotplug_work_fn(struct work_struct *work) 1197 { 1198 struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work); 1199 1200 acpi_os_wait_events_complete(); 1201 acpi_device_hotplug(hpw->adev, hpw->src); 1202 kfree(hpw); 1203 } 1204 1205 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src) 1206 { 1207 struct acpi_hp_work *hpw; 1208 1209 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 1210 "Scheduling hotplug event (%p, %u) for deferred execution.\n", 1211 adev, src)); 1212 1213 hpw = kmalloc(sizeof(*hpw), GFP_KERNEL); 1214 if (!hpw) 1215 return AE_NO_MEMORY; 1216 1217 INIT_WORK(&hpw->work, acpi_hotplug_work_fn); 1218 hpw->adev = adev; 1219 hpw->src = src; 1220 /* 1221 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because 1222 * the hotplug code may call driver .remove() functions, which may 1223 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush 1224 * these workqueues. 1225 */ 1226 if (!queue_work(kacpi_hotplug_wq, &hpw->work)) { 1227 kfree(hpw); 1228 return AE_ERROR; 1229 } 1230 return AE_OK; 1231 } 1232 1233 bool acpi_queue_hotplug_work(struct work_struct *work) 1234 { 1235 return queue_work(kacpi_hotplug_wq, work); 1236 } 1237 1238 acpi_status 1239 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle) 1240 { 1241 struct semaphore *sem = NULL; 1242 1243 sem = acpi_os_allocate_zeroed(sizeof(struct semaphore)); 1244 if (!sem) 1245 return AE_NO_MEMORY; 1246 1247 sema_init(sem, initial_units); 1248 1249 *handle = (acpi_handle *) sem; 1250 1251 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n", 1252 *handle, initial_units)); 1253 1254 return AE_OK; 1255 } 1256 1257 /* 1258 * TODO: A better way to delete semaphores? Linux doesn't have a 1259 * 'delete_semaphore()' function -- may result in an invalid 1260 * pointer dereference for non-synchronized consumers. Should 1261 * we at least check for blocked threads and signal/cancel them? 1262 */ 1263 1264 acpi_status acpi_os_delete_semaphore(acpi_handle handle) 1265 { 1266 struct semaphore *sem = (struct semaphore *)handle; 1267 1268 if (!sem) 1269 return AE_BAD_PARAMETER; 1270 1271 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle)); 1272 1273 BUG_ON(!list_empty(&sem->wait_list)); 1274 kfree(sem); 1275 sem = NULL; 1276 1277 return AE_OK; 1278 } 1279 1280 /* 1281 * TODO: Support for units > 1? 1282 */ 1283 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) 1284 { 1285 acpi_status status = AE_OK; 1286 struct semaphore *sem = (struct semaphore *)handle; 1287 long jiffies; 1288 int ret = 0; 1289 1290 if (!acpi_os_initialized) 1291 return AE_OK; 1292 1293 if (!sem || (units < 1)) 1294 return AE_BAD_PARAMETER; 1295 1296 if (units > 1) 1297 return AE_SUPPORT; 1298 1299 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", 1300 handle, units, timeout)); 1301 1302 if (timeout == ACPI_WAIT_FOREVER) 1303 jiffies = MAX_SCHEDULE_TIMEOUT; 1304 else 1305 jiffies = msecs_to_jiffies(timeout); 1306 1307 ret = down_timeout(sem, jiffies); 1308 if (ret) 1309 status = AE_TIME; 1310 1311 if (ACPI_FAILURE(status)) { 1312 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1313 "Failed to acquire semaphore[%p|%d|%d], %s", 1314 handle, units, timeout, 1315 acpi_format_exception(status))); 1316 } else { 1317 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, 1318 "Acquired semaphore[%p|%d|%d]", handle, 1319 units, timeout)); 1320 } 1321 1322 return status; 1323 } 1324 1325 /* 1326 * TODO: Support for units > 1? 1327 */ 1328 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units) 1329 { 1330 struct semaphore *sem = (struct semaphore *)handle; 1331 1332 if (!acpi_os_initialized) 1333 return AE_OK; 1334 1335 if (!sem || (units < 1)) 1336 return AE_BAD_PARAMETER; 1337 1338 if (units > 1) 1339 return AE_SUPPORT; 1340 1341 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, 1342 units)); 1343 1344 up(sem); 1345 1346 return AE_OK; 1347 } 1348 1349 acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read) 1350 { 1351 #ifdef ENABLE_DEBUGGER 1352 if (acpi_in_debugger) { 1353 u32 chars; 1354 1355 kdb_read(buffer, buffer_length); 1356 1357 /* remove the CR kdb includes */ 1358 chars = strlen(buffer) - 1; 1359 buffer[chars] = '\0'; 1360 } 1361 #endif 1362 1363 return AE_OK; 1364 } 1365 1366 acpi_status acpi_os_signal(u32 function, void *info) 1367 { 1368 switch (function) { 1369 case ACPI_SIGNAL_FATAL: 1370 printk(KERN_ERR PREFIX "Fatal opcode executed\n"); 1371 break; 1372 case ACPI_SIGNAL_BREAKPOINT: 1373 /* 1374 * AML Breakpoint 1375 * ACPI spec. says to treat it as a NOP unless 1376 * you are debugging. So if/when we integrate 1377 * AML debugger into the kernel debugger its 1378 * hook will go here. But until then it is 1379 * not useful to print anything on breakpoints. 1380 */ 1381 break; 1382 default: 1383 break; 1384 } 1385 1386 return AE_OK; 1387 } 1388 1389 static int __init acpi_os_name_setup(char *str) 1390 { 1391 char *p = acpi_os_name; 1392 int count = ACPI_MAX_OVERRIDE_LEN - 1; 1393 1394 if (!str || !*str) 1395 return 0; 1396 1397 for (; count-- && *str; str++) { 1398 if (isalnum(*str) || *str == ' ' || *str == ':') 1399 *p++ = *str; 1400 else if (*str == '\'' || *str == '"') 1401 continue; 1402 else 1403 break; 1404 } 1405 *p = 0; 1406 1407 return 1; 1408 1409 } 1410 1411 __setup("acpi_os_name=", acpi_os_name_setup); 1412 1413 #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ 1414 #define OSI_STRING_ENTRIES_MAX 16 /* arbitrary */ 1415 1416 struct osi_setup_entry { 1417 char string[OSI_STRING_LENGTH_MAX]; 1418 bool enable; 1419 }; 1420 1421 static struct osi_setup_entry 1422 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { 1423 {"Module Device", true}, 1424 {"Processor Device", true}, 1425 {"3.0 _SCP Extensions", true}, 1426 {"Processor Aggregator Device", true}, 1427 }; 1428 1429 void __init acpi_osi_setup(char *str) 1430 { 1431 struct osi_setup_entry *osi; 1432 bool enable = true; 1433 int i; 1434 1435 if (!acpi_gbl_create_osi_method) 1436 return; 1437 1438 if (str == NULL || *str == '\0') { 1439 printk(KERN_INFO PREFIX "_OSI method disabled\n"); 1440 acpi_gbl_create_osi_method = FALSE; 1441 return; 1442 } 1443 1444 if (*str == '!') { 1445 str++; 1446 if (*str == '\0') { 1447 osi_linux.default_disabling = 1; 1448 return; 1449 } else if (*str == '*') { 1450 acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS); 1451 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1452 osi = &osi_setup_entries[i]; 1453 osi->enable = false; 1454 } 1455 return; 1456 } 1457 enable = false; 1458 } 1459 1460 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1461 osi = &osi_setup_entries[i]; 1462 if (!strcmp(osi->string, str)) { 1463 osi->enable = enable; 1464 break; 1465 } else if (osi->string[0] == '\0') { 1466 osi->enable = enable; 1467 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX); 1468 break; 1469 } 1470 } 1471 } 1472 1473 static void __init set_osi_linux(unsigned int enable) 1474 { 1475 if (osi_linux.enable != enable) 1476 osi_linux.enable = enable; 1477 1478 if (osi_linux.enable) 1479 acpi_osi_setup("Linux"); 1480 else 1481 acpi_osi_setup("!Linux"); 1482 1483 return; 1484 } 1485 1486 static void __init acpi_cmdline_osi_linux(unsigned int enable) 1487 { 1488 osi_linux.cmdline = 1; /* cmdline set the default and override DMI */ 1489 osi_linux.dmi = 0; 1490 set_osi_linux(enable); 1491 1492 return; 1493 } 1494 1495 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 1496 { 1497 printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); 1498 1499 if (enable == -1) 1500 return; 1501 1502 osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ 1503 set_osi_linux(enable); 1504 1505 return; 1506 } 1507 1508 /* 1509 * Modify the list of "OS Interfaces" reported to BIOS via _OSI 1510 * 1511 * empty string disables _OSI 1512 * string starting with '!' disables that string 1513 * otherwise string is added to list, augmenting built-in strings 1514 */ 1515 static void __init acpi_osi_setup_late(void) 1516 { 1517 struct osi_setup_entry *osi; 1518 char *str; 1519 int i; 1520 acpi_status status; 1521 1522 if (osi_linux.default_disabling) { 1523 status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS); 1524 1525 if (ACPI_SUCCESS(status)) 1526 printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n"); 1527 } 1528 1529 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) { 1530 osi = &osi_setup_entries[i]; 1531 str = osi->string; 1532 1533 if (*str == '\0') 1534 break; 1535 if (osi->enable) { 1536 status = acpi_install_interface(str); 1537 1538 if (ACPI_SUCCESS(status)) 1539 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); 1540 } else { 1541 status = acpi_remove_interface(str); 1542 1543 if (ACPI_SUCCESS(status)) 1544 printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); 1545 } 1546 } 1547 } 1548 1549 static int __init osi_setup(char *str) 1550 { 1551 if (str && !strcmp("Linux", str)) 1552 acpi_cmdline_osi_linux(1); 1553 else if (str && !strcmp("!Linux", str)) 1554 acpi_cmdline_osi_linux(0); 1555 else 1556 acpi_osi_setup(str); 1557 1558 return 1; 1559 } 1560 1561 __setup("acpi_osi=", osi_setup); 1562 1563 /* 1564 * Disable the auto-serialization of named objects creation methods. 1565 * 1566 * This feature is enabled by default. It marks the AML control methods 1567 * that contain the opcodes to create named objects as "Serialized". 1568 */ 1569 static int __init acpi_no_auto_serialize_setup(char *str) 1570 { 1571 acpi_gbl_auto_serialize_methods = FALSE; 1572 pr_info("ACPI: auto-serialization disabled\n"); 1573 1574 return 1; 1575 } 1576 1577 __setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup); 1578 1579 /* Check of resource interference between native drivers and ACPI 1580 * OperationRegions (SystemIO and System Memory only). 1581 * IO ports and memory declared in ACPI might be used by the ACPI subsystem 1582 * in arbitrary AML code and can interfere with legacy drivers. 1583 * acpi_enforce_resources= can be set to: 1584 * 1585 * - strict (default) (2) 1586 * -> further driver trying to access the resources will not load 1587 * - lax (1) 1588 * -> further driver trying to access the resources will load, but you 1589 * get a system message that something might go wrong... 1590 * 1591 * - no (0) 1592 * -> ACPI Operation Region resources will not be registered 1593 * 1594 */ 1595 #define ENFORCE_RESOURCES_STRICT 2 1596 #define ENFORCE_RESOURCES_LAX 1 1597 #define ENFORCE_RESOURCES_NO 0 1598 1599 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1600 1601 static int __init acpi_enforce_resources_setup(char *str) 1602 { 1603 if (str == NULL || *str == '\0') 1604 return 0; 1605 1606 if (!strcmp("strict", str)) 1607 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT; 1608 else if (!strcmp("lax", str)) 1609 acpi_enforce_resources = ENFORCE_RESOURCES_LAX; 1610 else if (!strcmp("no", str)) 1611 acpi_enforce_resources = ENFORCE_RESOURCES_NO; 1612 1613 return 1; 1614 } 1615 1616 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup); 1617 1618 /* Check for resource conflicts between ACPI OperationRegions and native 1619 * drivers */ 1620 int acpi_check_resource_conflict(const struct resource *res) 1621 { 1622 acpi_adr_space_type space_id; 1623 acpi_size length; 1624 u8 warn = 0; 1625 int clash = 0; 1626 1627 if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) 1628 return 0; 1629 if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM)) 1630 return 0; 1631 1632 if (res->flags & IORESOURCE_IO) 1633 space_id = ACPI_ADR_SPACE_SYSTEM_IO; 1634 else 1635 space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY; 1636 1637 length = resource_size(res); 1638 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) 1639 warn = 1; 1640 clash = acpi_check_address_range(space_id, res->start, length, warn); 1641 1642 if (clash) { 1643 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) { 1644 if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX) 1645 printk(KERN_NOTICE "ACPI: This conflict may" 1646 " cause random problems and system" 1647 " instability\n"); 1648 printk(KERN_INFO "ACPI: If an ACPI driver is available" 1649 " for this device, you should use it instead of" 1650 " the native driver\n"); 1651 } 1652 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT) 1653 return -EBUSY; 1654 } 1655 return 0; 1656 } 1657 EXPORT_SYMBOL(acpi_check_resource_conflict); 1658 1659 int acpi_check_region(resource_size_t start, resource_size_t n, 1660 const char *name) 1661 { 1662 struct resource res = { 1663 .start = start, 1664 .end = start + n - 1, 1665 .name = name, 1666 .flags = IORESOURCE_IO, 1667 }; 1668 1669 return acpi_check_resource_conflict(&res); 1670 } 1671 EXPORT_SYMBOL(acpi_check_region); 1672 1673 /* 1674 * Let drivers know whether the resource checks are effective 1675 */ 1676 int acpi_resources_are_enforced(void) 1677 { 1678 return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT; 1679 } 1680 EXPORT_SYMBOL(acpi_resources_are_enforced); 1681 1682 bool acpi_osi_is_win8(void) 1683 { 1684 return acpi_gbl_osi_data >= ACPI_OSI_WIN_8; 1685 } 1686 EXPORT_SYMBOL(acpi_osi_is_win8); 1687 1688 /* 1689 * Deallocate the memory for a spinlock. 1690 */ 1691 void acpi_os_delete_lock(acpi_spinlock handle) 1692 { 1693 ACPI_FREE(handle); 1694 } 1695 1696 /* 1697 * Acquire a spinlock. 1698 * 1699 * handle is a pointer to the spinlock_t. 1700 */ 1701 1702 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp) 1703 { 1704 acpi_cpu_flags flags; 1705 spin_lock_irqsave(lockp, flags); 1706 return flags; 1707 } 1708 1709 /* 1710 * Release a spinlock. See above. 1711 */ 1712 1713 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags) 1714 { 1715 spin_unlock_irqrestore(lockp, flags); 1716 } 1717 1718 #ifndef ACPI_USE_LOCAL_CACHE 1719 1720 /******************************************************************************* 1721 * 1722 * FUNCTION: acpi_os_create_cache 1723 * 1724 * PARAMETERS: name - Ascii name for the cache 1725 * size - Size of each cached object 1726 * depth - Maximum depth of the cache (in objects) <ignored> 1727 * cache - Where the new cache object is returned 1728 * 1729 * RETURN: status 1730 * 1731 * DESCRIPTION: Create a cache object 1732 * 1733 ******************************************************************************/ 1734 1735 acpi_status 1736 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache) 1737 { 1738 *cache = kmem_cache_create(name, size, 0, 0, NULL); 1739 if (*cache == NULL) 1740 return AE_ERROR; 1741 else 1742 return AE_OK; 1743 } 1744 1745 /******************************************************************************* 1746 * 1747 * FUNCTION: acpi_os_purge_cache 1748 * 1749 * PARAMETERS: Cache - Handle to cache object 1750 * 1751 * RETURN: Status 1752 * 1753 * DESCRIPTION: Free all objects within the requested cache. 1754 * 1755 ******************************************************************************/ 1756 1757 acpi_status acpi_os_purge_cache(acpi_cache_t * cache) 1758 { 1759 kmem_cache_shrink(cache); 1760 return (AE_OK); 1761 } 1762 1763 /******************************************************************************* 1764 * 1765 * FUNCTION: acpi_os_delete_cache 1766 * 1767 * PARAMETERS: Cache - Handle to cache object 1768 * 1769 * RETURN: Status 1770 * 1771 * DESCRIPTION: Free all objects within the requested cache and delete the 1772 * cache object. 1773 * 1774 ******************************************************************************/ 1775 1776 acpi_status acpi_os_delete_cache(acpi_cache_t * cache) 1777 { 1778 kmem_cache_destroy(cache); 1779 return (AE_OK); 1780 } 1781 1782 /******************************************************************************* 1783 * 1784 * FUNCTION: acpi_os_release_object 1785 * 1786 * PARAMETERS: Cache - Handle to cache object 1787 * Object - The object to be released 1788 * 1789 * RETURN: None 1790 * 1791 * DESCRIPTION: Release an object to the specified cache. If cache is full, 1792 * the object is deleted. 1793 * 1794 ******************************************************************************/ 1795 1796 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) 1797 { 1798 kmem_cache_free(cache, object); 1799 return (AE_OK); 1800 } 1801 #endif 1802 1803 static int __init acpi_no_static_ssdt_setup(char *s) 1804 { 1805 acpi_gbl_disable_ssdt_table_install = TRUE; 1806 pr_info("ACPI: static SSDT installation disabled\n"); 1807 1808 return 0; 1809 } 1810 1811 early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup); 1812 1813 static int __init acpi_disable_return_repair(char *s) 1814 { 1815 printk(KERN_NOTICE PREFIX 1816 "ACPI: Predefined validation mechanism disabled\n"); 1817 acpi_gbl_disable_auto_repair = TRUE; 1818 1819 return 1; 1820 } 1821 1822 __setup("acpica_no_return_repair", acpi_disable_return_repair); 1823 1824 acpi_status __init acpi_os_initialize(void) 1825 { 1826 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1827 acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1828 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); 1829 acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block); 1830 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) { 1831 /* 1832 * Use acpi_os_map_generic_address to pre-map the reset 1833 * register if it's in system memory. 1834 */ 1835 int rv; 1836 1837 rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register); 1838 pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv); 1839 } 1840 acpi_os_initialized = true; 1841 1842 return AE_OK; 1843 } 1844 1845 acpi_status __init acpi_os_initialize1(void) 1846 { 1847 kacpid_wq = alloc_workqueue("kacpid", 0, 1); 1848 kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1); 1849 kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0); 1850 BUG_ON(!kacpid_wq); 1851 BUG_ON(!kacpi_notify_wq); 1852 BUG_ON(!kacpi_hotplug_wq); 1853 acpi_install_interface_handler(acpi_osi_handler); 1854 acpi_osi_setup_late(); 1855 return AE_OK; 1856 } 1857 1858 acpi_status acpi_os_terminate(void) 1859 { 1860 if (acpi_irq_handler) { 1861 acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt, 1862 acpi_irq_handler); 1863 } 1864 1865 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block); 1866 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block); 1867 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); 1868 acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block); 1869 if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) 1870 acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register); 1871 1872 destroy_workqueue(kacpid_wq); 1873 destroy_workqueue(kacpi_notify_wq); 1874 destroy_workqueue(kacpi_hotplug_wq); 1875 1876 return AE_OK; 1877 } 1878 1879 acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control, 1880 u32 pm1b_control) 1881 { 1882 int rc = 0; 1883 if (__acpi_os_prepare_sleep) 1884 rc = __acpi_os_prepare_sleep(sleep_state, 1885 pm1a_control, pm1b_control); 1886 if (rc < 0) 1887 return AE_ERROR; 1888 else if (rc > 0) 1889 return AE_CTRL_SKIP; 1890 1891 return AE_OK; 1892 } 1893 1894 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state, 1895 u32 pm1a_ctrl, u32 pm1b_ctrl)) 1896 { 1897 __acpi_os_prepare_sleep = func; 1898 } 1899 1900 acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a, 1901 u32 val_b) 1902 { 1903 int rc = 0; 1904 if (__acpi_os_prepare_extended_sleep) 1905 rc = __acpi_os_prepare_extended_sleep(sleep_state, 1906 val_a, val_b); 1907 if (rc < 0) 1908 return AE_ERROR; 1909 else if (rc > 0) 1910 return AE_CTRL_SKIP; 1911 1912 return AE_OK; 1913 } 1914 1915 void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state, 1916 u32 val_a, u32 val_b)) 1917 { 1918 __acpi_os_prepare_extended_sleep = func; 1919 } 1920